Somehow I managed to fix my problem without any updates. I simply turned off dma (on secondary ide channels), rebooted the system, then enabled each one, one at a time. Now one id ultra dma mode2 and the other is multi-word dma mode 2. I have no more problems now, video, audio cd, and file transfers go smoothly. I did afterwards install the sis735 agp chipset update. I'm wondering if this problem happens only with certain revisions of this motherboard. Do you people think that the problem might come back? Should I apply the sis.exe fix?